What do guys think of long hair?

I really want to grow my hair out. It is currently dark brown and slightly past my shoulders. I have given up heated styling tools and I am taking biotin to keep my hair healthy. I understand that long ratty hair is just plain unattractive. I would like to grow it out to a tiny bit past my elbows. What do guys think of this length? If I keep it healthy, would you think its attractive?